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library(tidyverse)
covid19 <- read_csv("data/covid19-daily-cases.csv")

Parsed with column specification:
cols(
  country_region = col_character(),
  date = col_date(format = ""),
  confirmed = col_double()
)

covid19

covid19 %>% 
  ggplot(aes(
    x = date, 
    y = confirmed, 
    colour = country_region)) +
  geom_line() +
  guides(colour = FALSE)

Fit with log scale because then its normal

covid19 %>% 
  ggplot(aes(
    x = date, 
    y = log10(confirmed),
    colour = country_region)) +
  geom_line() +
  guides(colour = FALSE)

covid19 %>% 
  ggplot(aes(
    x = date, 
    y = confirmed, 
    colour = country_region)) +
  geom_line() +
  guides(colour = FALSE) +
  scale_y_log10()

covid19_rel <- covid19 %>% 
  group_by(country_region) %>% 
  mutate(days = as.numeric(date - min(date))) %>% 
  ungroup()
covid19_rel

covid19_rel %>% 
  ggplot(aes(
    x = days,
    y = confirmed, 
    colour = country_region)) +
  geom_line() +
  scale_y_log10() +
  guides(colour = FALSE)

covid19_nz <- covid19_rel %>% 
  filter(country_region == "New Zealand")
p_nz <- covid19_rel %>% 
  ggplot(aes(x = days, y = confirmed, 
    group = country_region)) +
  geom_line(colour = "grey", alpha = 0.5) +
  geom_line(colour = "#238b45", size = 1, data = covid19_nz) +
  scale_y_log10() +
  guides(colour = FALSE)
p_nz

p_nz <- p_nz +
  geom_label(aes(
    x = max(days), y = max(confirmed),
    label = country_region), data = covid19_nz,
    colour = "#238b45", nudge_x = 3, nudge_y = .5)
p_nz

p_nz <- p_nz +
  scale_y_log10(labels = scales::label_comma()) +
  xlim(c(0, 100))

Scale for 'y' is already present. Adding another scale for 'y', which will replace the existing scale.

p_nz

p_nz <- p_nz +
  labs(
    x = "Days since March 1",
    y = "Confirmed cases (on log10)",
    title = "Worldwide coronavirus confirmed cases",
    subtitle = "highlighting New Zealand",
    caption = "Data source: John Hopkins University, CSSE"
  )
p_nz

library(plotly)

Registered S3 method overwritten by 'data.table':
  method           from
  print.data.table     
Registered S3 methods overwritten by 'htmltools':
  method               from         
  print.html           tools:rstudio
  print.shiny.tag      tools:rstudio
  print.shiny.tag.list tools:rstudio
Registered S3 method overwritten by 'htmlwidgets':
  method           from         
  print.htmlwidget tools:rstudio

Attaching package: 㤼㸱plotly㤼㸲

The following object is masked from 㤼㸱package:ggplot2㤼㸲:

    last_plot

The following object is masked from 㤼㸱package:stats㤼㸲:

    filter

The following object is masked from 㤼㸱package:graphics㤼㸲:

    layout

ggplotly(p_nz)

Transformation introduced infinite values in continuous y-axisgeom_GeomLabel() has yet to be implemented in plotly.
  If you'd like to see this geom implemented,
  Please open an issue with your example code at
  https://github.com/ropensci/plotly/issues